166899842226 has 128 divisors (see below), whose sum is σ = 423452413440. Its totient is φ = 48271417344.

The previous prime is 166899842189. The next prime is 166899842227. The reversal of 166899842226 is 622248998661.

It is not an unprimeable number, because it can be changed into a prime (166899842227) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9813186 + ... + 9830178.

It is an arithmetic number, because the mean of its divisors is an integer number (3308221980).

Almost surely, 2^166899842226 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166899842226, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (211726206720).

166899842226 is an abundant number, since it is smaller than the sum of its proper divisors (256552571214).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166899842226 is a wasteful number, since it uses less digits than its factorization.

166899842226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17857 (or 17851 counting only the distinct ones).

The product of its digits is 35831808, while the sum is 63.

The spelling of 166899842226 in words is "one hundred sixty-six billion, eight hundred ninety-nine million, eight hundred forty-two thousand, two hundred twenty-six".